Question

If a force of 12 N acting on a body changes its velocity uniformly from 2 m/s to 5
m/s in 20 s then what is the mass of the body?

Answer 1

Answer:

Acceleration is the change in velocity

therefore, a=5-2/20

a=3/20

We know that f=ma

therefore, 12=M3/20

M=12.20/3

M=80 kg.

Answer 2

QUESTION-:

If a force of 12 N acting on a body changes its velocity uniformly from 2 m/s to 5  m/s in 20 s then what is the mass of the body?

EXPLANATION-:

• Mass of body, m =??
• Force applied, F= 12 N
• Final velocity, v=5 m/s
• Initial velocity,u=2 m/s
• Time taken ,t=20 s

We know that-:

$\longrightarrow \underline{\boxed{\underline{\tt F=m\times \frac{v-u}{t}}}}$

Putting values in the formula to find mass -:

$\rightarrow \bf\; 12=m \times \frac{5-2}{20}\\\\\rightarrow \bf\; 12=\frac{3m}{20}\\\\\rightarrow \bf\; 240=3m\\\\\rightarrow \bf\; m=\frac{240}{3}\\\\\implies \boxed{\bf\; m=80\;kg}$

∴The mass of the body is 80 kg .